1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <string>
10
11// template<> struct char_traits<char>
12
13// static const char_type* find(const char_type* s, size_t n, const char_type& a);
14// constexpr in C++17
15
16#include <string>
17#include <cassert>
18
19#include "test_macros.h"
20
21#if TEST_STD_VER > 14
22constexpr bool test_constexpr() {
23 constexpr const char* p = "123";
24 return std::char_traits<char>::find(p, 3, '1') == p && std::char_traits<char>::find(p, 3, '2') == p + 1 &&
25 std::char_traits<char>::find(p, 3, '3') == p + 2 && std::char_traits<char>::find(p, 3, '4') == nullptr;
26}
27#endif
28
29int main(int, char**) {
30 char s1[] = {1, 2, 3};
31 assert(std::char_traits<char>::find(s1, 3, char(1)) == s1);
32 assert(std::char_traits<char>::find(s1, 3, char(2)) == s1 + 1);
33 assert(std::char_traits<char>::find(s1, 3, char(3)) == s1 + 2);
34 assert(std::char_traits<char>::find(s1, 3, char(4)) == 0);
35 assert(std::char_traits<char>::find(s1, 3, char(0)) == 0);
36 assert(std::char_traits<char>::find(NULL, 0, char(0)) == 0);
37
38#if TEST_STD_VER > 14
39 static_assert(test_constexpr(), "");
40#endif
41
42 return 0;
43}
44

source code of libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/find.pass.cpp